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I want at least the same sound quality as my current setup. I am looking to install the KVT-915DVD but I am hearing mixed things about running through the stock HK amp and double amping, and introducing distortion.

If you want better sound quality, your approach might not be the best one. By only upgrading the head unit, at best, you will have the same quality as with the factory head unit. You will not get better sound quality or more power than what you already have.

You might want to consider either upgrading the whole thing, or replacing amps/speakers with aftermarket.

I am not looking for specially better sound, I am content for the sound quality now, I just don't want it degraded. If I bypass the HK amp, don't I need new speakers too since the HK uses different ohms?

I am not looking for specially better sound, I am content for the sound quality now, I just don't want it degraded. If I bypass the HK amp, don't I need new speakers too since the HK uses different ohms?

They did not make it easy to upgrade. You could use the facroty speakers and bypass the amplifiers, but you need to either build custom crossovers for the speakers or have a channel of amplification for each speaker and use amplifiers with built-in crossovers, which is a very expensive option.

What are you trying to improve? You want more bass, louder stereo, more features (i.e. xm radio, mp3 player)?